Investigations on the Planting Technique of Alder

1991

16 S.

1 Abb., 2 Tab.,

Bandaufführung

5651

47516

In the spring of 1986 a field trial with Alnus glutinosa (L.) Gaertn. seedlings of various ages, such as 1+0, 2+0, was established. The seedlings were subjected to four different treatments. The first group seedlings. They were planted as usual. The second group seedlings were trimmed (cut) from the top as one third of their stem height then planted as usual. Third group seedlings were trimmed from the top as with the second, then planted as deep as one third of their stem length to be under the soil. The fourth group of the seedlings were not trimmed, but deep planted as third group. The orijin of seedlings was Meryemana. They were grown at Meryemena Research Nursery (950m). Experimental area was at Meryemana Research Forest located at 39 Grad 40 N latitude, 40 Grad 39 W longitude, 1250 m above sea level. The aspect was west-north, the gradient of slope was 40% and the soil was stony and silt loam. Planting holes were of the same sitze for all seedlings (50 x 50 x 50cm). Field trial was established as a randomised block desing with three replicationseach containing twenty-five seedlings on a line per treatment. Table 1 shows the ages, types and the mean heights of seedlings when they were planted (Table 1). As a results of measurements on the seedlings for four years, it was conluded that neither deep planting nor trimming the seedling caused no significant differences among seedlings both on height growth and survival percentage. The regression equantion representing the four years growth pattern of the Alnus seedling was estimated as follows log Y = a+b log X (Y = height cm, x = years). The growth rate of 1+0 year old seedling was faster than that of two-year old ones. Neither one year nor two-year old seedlings grew over the annual weed mean height zone (1m) during their first year. Survival percentages of seedlings by age (1+0, 2+0, 1+1) were 87%, 92% and 96% respectively. In spite of the slightly lower survival rate of one-year old planted seedlings, it was concluded that it would be better to use one-year old seedling instead of two-year old ones because of its faster initial height growth and its lower cost. Normal and cut seedlings showed the same performance in the field. To use cut seedlings, especialy for large ones, instead of normal seedlings was more handy for packing and transportation.